CLK/Storage/Tape/Parsers/Acorn.hpp

//
//  Acorn.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 06/11/2016.
//  Copyright 2016 Thomas Harte. All rights reserved.
//

#pragma once

#include "TapeParser.hpp"
#include "../../../Numeric/CRC.hpp"
#include "../../Disk/DPLL/DigitalPhaseLockedLoop.hpp"

namespace Storage::Tape::Acorn {

class Shifter {
public:
	Shifter();

	void process_pulse(const Storage::Tape::Tape::Pulse &);

	struct Delegate {
		virtual void acorn_shifter_output_bit(int value) = 0;
	};
	void set_delegate(Delegate *delegate) {
		delegate_ = delegate;
	}

	void digital_phase_locked_loop_output_bit(int value);

private:
	Storage::DigitalPhaseLockedLoop<Shifter, 15> pll_;
	bool was_high_;

	unsigned int input_pattern_;

	Delegate *delegate_;
};

enum class SymbolType {
	One, Zero
};

class Parser: public Storage::Tape::Parser<SymbolType>, public Shifter::Delegate {
public:
	Parser();

	int get_next_bit(const std::shared_ptr<Storage::Tape::Tape> &);
	int get_next_byte(const std::shared_ptr<Storage::Tape::Tape> &);
	unsigned int get_next_short(const std::shared_ptr<Storage::Tape::Tape> &);
	unsigned int get_next_word(const std::shared_ptr<Storage::Tape::Tape> &);
	void reset_crc();
	uint16_t get_crc() const;

private:
	void acorn_shifter_output_bit(int value) override;
	void process_pulse(const Storage::Tape::Tape::Pulse &) override;

	bool did_update_shifter(int new_value, int length);
	CRC::Generator<uint16_t, 0x0000, 0x0000, false, false> crc_;
	Shifter shifter_;
};

}